osdep: Document differences in rounding macros
Make it obvious which macros are safe in which situations. Useful since QEMU_ALIGN_UP and ROUND_UP both purport to do the same thing, but differ on whether the alignment must be a power of 2. Signed-off-by: NEric Blake <eblake@redhat.com> Message-Id: <1469129688-22848-4-git-send-email-eblake@redhat.com> Signed-off-by: NPaolo Bonzini <pbonzini@redhat.com>
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